Initial commit from prod-batam

extensions/cornerstone/src/state.ts

@@ -0,0 +1,34 @@
+const state = {
+  // The `defaultContext` of an extension's commandsModule
+  DEFAULT_CONTEXT: 'CORNERSTONE',
+  enabledElements: {},
+};
+
+/**
+ * Sets the enabled element `dom` reference for an active viewport.
+ * @param {HTMLElement} dom Active viewport element.
+ * @return void
+ */
+const setEnabledElement = (viewportId: string, element: HTMLElement, context?: string): void => {
+  const targetContext = context || state.DEFAULT_CONTEXT;
+
+  state.enabledElements[viewportId] = {
+    element,
+    context: targetContext,
+  };
+};
+
+/**
+ * Grabs the enabled element `dom` reference of an active viewport.
+ *
+ * @return {HTMLElement} Active viewport element.
+ */
+const getEnabledElement = viewportId => {
+  return state.enabledElements[viewportId];
+};
+
+const reset = () => {
+  state.enabledElements = {};
+};
+
+export { setEnabledElement, getEnabledElement, reset };